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I-93 SB on Ramp over Nhrr Constitution Av.

Merrimack County, New Hampshire · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

I-93 SB on Ramp over Nhrr Constitution Av. in Merrimack County, New Hampshire, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1949 and reconstructed in 1981, making it 76 years old at the 2025 inventory.
It carries about 3,658 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 153 of the 326 inventoried bridges in Merrimack County rated fair (46.9%); 27 (8.3%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 131 ft
Location	0.1 Mi West of Jct I-93
NBI structure number	005201520010700
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the New Hampshire department of transportation.

Bridge	Built	Vehicles/day	Condition
I-93 Fee Tpk Ramp over Hackett Hill Road	1978	86,013	Fair
I-93 Fee Tpk over Cross Road	1956	82,029	Fair
I-93 Fee Tpk over Ramp A-b	1957	79,640	Fair
I-93 Fee Tpk over Dow Road	1957	78,501	Fair
I-93 Fee Tpk over Robinson Road	1957	78,501	Fair
I-93 Fee Tpk over US 3 Manchester Street	2000	75,054	Good